Hello, 200001

Is anybody able to put this in words for me?

(Why the two shaded triangles are similar.)Code:A * - - - - - - - - - - - - - - - * F |* * | |:* * | |::* * | | β * * | |::::* * | |:::::* * | |::::::* 9 * | |:::::::* * E |::::::::* *::| |:::::::::* 3 *: α :| |::::::::::* *::::::::| |:::::::::::* 90° *:::::::::::| |:::::::: α :* *: β ::::::::::| B * - - - - - - * - - - - - - - - * D C

In right triangle , let

Then is the complement of

At point , we have: .

. . Hence: .

In right triangle is the complement of

. . Hence: .

Therefore: .